(Solved): The synthesis of methyl 4-methylpentanoate starting from 2-methylbutane invol ...

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The synthesis of methyl 4-methylpentanoate starting from 2-methylbutane involves several steps. The first part of the transformation is illustrated below. The transformation above can be performed with some reagent or combination of the reagents listed below. Give the necessary reagent(s) in the correct order, as a string of letters (without spaces or punctuation, such as "EBF"). If there is more than one correct solution, provide just one answer. $\begin{array}{c}A\\ \text{ t-BuOK }\end{array}$ B C 1) ${\mathrm{O}}_3$; 2) DMS ${\mathrm{Br}}_2$, hv D $\begin{array}{ccc}\text{ D }& \text{ E }& \text{ F }\\ \text{ conc. }{\mathrm{H}}_2{\mathrm{SO}}_4\text{, heat }& {\mathrm{H}}_2\text{, Lindlar’s cat. }& \mathrm{NaOMe}\end{array}$ G $\mathrm{H}$ $\mathrm{HBr},\mathrm{ROOR}$ I $\mathrm{HBr}$ 1) ${\mathrm{NaNH}}_2$; 2) Mel